Players Should Be able to choose a weapon for any unit. Such as a Terran Marine Can switch to a pistol to a Machine Gun with a Possible Upgrade. Also when a Terran Tank will be Build from a Factory, it should be manditory far a Possible upgrade for a marine or SCV to have an Upgrade to be able to Use the terran Tanks. Or ugrade a Terran Civllian to Pilots. I don't Know what do you Guys think about my opinion but it will be cool also Realistic if this was done.